All of my devices are calibrated from 1.000 all the way to 1.085, according to the specific build specifications I use. This gives improved accuracy and saves you time and effort doing it yourself! They will leave my workshop with the calibration formula added to the configuration settings. Note that due to how the ispindel works they will give a very close estimate of Specific Gravity; the FREE full calibration service that I include will improve this even further. The data is very accurate, but do not expect an exact correlation to a manual gravity reading across the whole range - anyone promising this is either lying to sell you additional services 🤥, or doesn't know how they work! 😂

Simply drop the hydrometer into your wort when pitching the yeast to monitor the progress of fermentation, minimising the need open the lid and risking infection, or waste any of your precious beer taking a sample. Using FREE apps and online tools with the iSpindel, you can monitor fermentation progress and brew temperature online and control devices such as beer warming matts in order to tightly control fermentation temperature. Brewfather, Brewspy and ubidots are popular monitoring choices.

This is FULLY ASSEMBLED and calibrated - no soldering skills required, and no need to hunt eBay for components! Full support provided to get you up and running. 100% satisfaction guarantee - just message with any questions or issues. I have a Masters Degree in Electronic Engineering, and provide 7 days a week support if help is needed to get your device up and running - just message or email (details provided with your device). I ensure full satisfaction and will happily assist weeks, months and years after purchase!

GENUINE HARDWARE: I have found many wemos control boards are suffering significant quality control issues. I am therefore now using only GENUINE Lolin Wemos control boards (now updated to v4.0!), manufactured by the genuine and trusted original developer of these components. The market is flooded with wemos 'clones' that are cheap Chinese copies of these boards; they often have issues with increased power drain and poor wifi strength that will severely impact the operation of the iSpindel. The clones can be spotted easily as they use micro USB and often have very large chips. The GENUINE boards I use are more than double the price, but are far more reliable, and built to a far higher standard. Don't waste your money on board that will only last a few days, is built with cheap components and may fail mid-brew or even from first switch on! As always, you get what you pay for!

• Latest v4.0 Geniune Lolin Wemos D1 Mini control board. This has been updated by the manufacturer to use the latest components for optimal performance!
• I have tested the rubber gasket that some suggest can be used to prevent leaks, but I actually find that this can *cause* leaks! The tubes are designed to fully seal and be water tight - and just like a pressurised coke bottle, they do not need an additional rubber seal. Indeed, this can become distorted when tightening the cap, and increase the risk of a poor seal. I therefore DO NOT include one - just make sure you fully tighten the cap.
• I will ALWAYS supply a genuine UK sourced cell from a reliable and trustworthy UK supplier. AVOID any listing that do not show the battery they are using - they will likely be the wrong weight, and potentially dangerous.
• Be careful of other designs that require internal wires that may become loose over time (check listing pictures carefully!)
• Be careful of designs that require you to desolder the battery or physically move components to make balance adjustments. Not only can these loosen over time and become unreliable if the process is repeated, but the joints may also loosen over time, especially in a warm brew. 
• The board is a nice snug fit into the tube and will not move or need re-calibration between brews. The tube is tried and proven to not leak under pressure - so no worries for those who like to brew using this method, and no need to add additional seals and weight (but you still obviously need to close the lid tightly!). Also fully Pinter (1, 2 AND 3!) compatible with many happy customers!
• Fitted with a USB C battery charging port with charge/discharge protection built in.
• Most reliable 6.5.1 iSpindel firmware installed. Later versions are available, many are reporting bugs, so I'm sticking with 6.5.1 for now. Be careful with devices shipping with the latest firmware, and be sure you have the technical knowledge to downgrade if you have problems.

Full details for the iSpindel device, configuration and usage just search YouTube - there is a wealth of information. I provide support 7 days a week of required. 🤟

I have an assortment of colours as shown the photo. Please add a note at checkout if you would like any particular colour cap, board or even a specific combination. Great if you have more than one iSpindel! I will send a random colour if you do not specify or if I am running short on colours!

I take no credit for hardware and software design, I am a hobbyist brewer and like tinkering with electronics. I am not a commercial enterprise, and iSpindel is an open-source project. You are paying for the parts and the time/effort/expertise to source those parts, assemble the device and install the firmware onto the microprocessor control board. The software is distributed under the iSpindel Opensource license. Details readily available online via github and the iSpindel website. Some basic IT skills are required for configuring and calibrating, but everything can be done easily through a phone browser.

This listing is intended for UK buyers - Royal Mail 2nd Class postage is included in the price. There is an option on checkout to upgrade to First Class or Special Delivery at extra cost.

For non-UK buyers, see my other listing with WORLDWIDE postage options that will use the eBay Global Shipping program for delivery to you.